Numerical investigation of wake modes for flow past three tandem cylinders using the multi-relaxation-time lattice Boltzmann method for different gap spacings

2014 ◽  
Vol 38 (3) ◽  
pp. 799-812 ◽  
Author(s):  
Shams Ul-Islam ◽  
Waqas Sarwar Abbasi ◽  
Hamid Rahman ◽  
Rizwana Naheed
Keyword(s):  
Relaxation Time ◽  
Lattice Boltzmann Method ◽  
Numerical Investigation ◽  
Lattice Boltzmann ◽  
Tandem Cylinders ◽  
Flow Past ◽  
Gap Spacings ◽  
Wake Modes ◽  
Boltzmann Method

Numerical investigation of magnetic multiphase flows by the fractional-step-based multiphase lattice Boltzmann method

2020 ◽  
Vol 32 (8) ◽  
pp. 083309 ◽  
Author(s):  
Xiang Li ◽  
Zhi-Qiang Dong ◽  
Peng Yu ◽  
Xiao-Dong Niu ◽  
Lian-Ping Wang ◽  
...  
Keyword(s):  
Lattice Boltzmann Method ◽  
Numerical Investigation ◽  
Lattice Boltzmann ◽  
Multiphase Flows ◽  
Fractional Step ◽  
Boltzmann Method

MRT RECTANGULAR LATTICE BOLTZMANN METHOD

2012 ◽  
Vol 23 (05) ◽  
pp. 1250040 ◽  
Author(s):  
JIAN GUO ZHOU
Keyword(s):  
Relaxation Time ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Standard Procedure ◽  
Accurate Solution ◽  
Square Lattice ◽  
Rectangular Lattice ◽  
Complex Flow ◽  
Dominant Feature ◽  
Boltzmann Method

A multiple-relaxation-time (MRT) collision operator is introduced into the author's rectangular lattice Boltzmann method for simulating fluid flows. The model retains both the advantages and the standard procedure of using a constant transformation matrix in the conventional MRT scheme on a square lattice, leading to easy implementation in the algorithm. This allows flow problems characterized by dominant feature in one direction to be solved more efficiently. Two numerical tests have been carried out and shown that the proposed model is able to capture complex flow characteristics and generate an accurate solution if an appropriate lattice ratio is used. The model is found to be more stable compared to the original rectangular lattice Boltzmann method using the single relaxation time.

NUMERICAL SIMULATION OF THE FLOWS OVER TWO TANDEM CYLINDERS BY LATTICE BOLTZMANN METHOD

2005 ◽  
Vol 19 (28n29) ◽  
pp. 1551-1554 ◽  
Author(s):  
XIAOKE KU ◽  
JIANZHONG LIN
Keyword(s):  
Numerical Simulation ◽  
Pressure Distribution ◽  
Lattice Boltzmann Method ◽  
Stagnation Point ◽  
Lattice Boltzmann ◽  
Reynolds Numbers ◽  
Effective Distance ◽  
Minimum Pressure ◽  
Tandem Cylinders ◽  
Boltzmann Method

Flows over two tandem cylinders are simulated numerically based on the lattice Boltzmann method. The pressure distribution on the cylinders for varying distance between the two cylinders at different Reynolds numbers is depicted. The results show that the minimum pressure on the front cylinder does not occur at the stagnation point because of the existence of the back cylinder. The distance between the point with minimum pressure and the stagnation point becomes large with increasing Re number. The minimum pressure on the back cylinder varies with the distance between the two cylinders. The effective distance of interaction between two cylinders is less than 4d with d being the diameter of the cylinder.

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